Synthesis of carbon quantum dots from cabbage with down- and up-conversion photoluminescence properties: excellent imaging agent for biomedical applications

Abstract

The synthesis of luminescent and biocompatible carbon quantum dots is demonstrated from cabbage, a new carbonaceous biomaterial, for bio-imaging.

Green synthesis of fluorescent carbon dots from carrot juice for in vitro cellular imaging

“…By contrast, the hydrothermal method is considered to be a facile, green, and efficient approach. Recently, natural biomass precursors as raw materials (such as glucose, konjac, chitosan, potato, Prunus mume fruit, cabbage, egg, grass, coffee, and others) for the preparation of functional CDs via the hydrothermal method have gained popularity due to the abundance of these carbon sources, as well as their availability, low cost, and eco-friendliness [14,[20][21][22][23][24][25][26][27][28]. In this regard, the preparation of high quality CDs from a suitable biomass as a carbon source is essential.…”

“…The reactor was then operated at 160°C for 6 h and cooled naturally before opening. The raw solution was subsequently centrifuged at 8000 rpm for 30 min to remove large http://carbonlett.org C-O-C, C-N, and C=O, respectively [21,30]. Similarly, the three peaks for N 1s (Fig.…”

“…The purified CD aqueous dispersion exhibited vivid cyan emission under UV 365 nm wavelength whilst it showed slight yellow under natural light. The quantum yield was calculated as 5.16%, and quinine sulphate was used for the determination of the QY as the standard reference [21].…”

“…HaCaT cells were selected and cultured at 37°C, 5% CO 2 and 95% humidity, and a serum-free Keratinocyte-serum free medium basal medium supplemented with 10% fetal bovine serum, penicillin (100 IU mL −1 ), and streptomycin (100 μg mL ) was adopted [21].…”

Silicon solar cell efficiency improvement employing the photoluminescent, down-shifting effects of carbon and CdTe quantum dots

“…Variations in the applied current determine the size of the synthesized carbon nanoparticles such that the colors observed [20,21], with an excitation with a wavelength of 360 nm, vary from violet (400 nm) to green (550 nm) [22] with the maximum at approximately 420 nm (see Fig. 4) [23].…”